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Assign output of os.system to a variable and prevent it from being displayed on the screen [duplicat
... the output of a command I run using os.system to a variable and prevent it from being output to the screen. But, in the below code ,the output is sent to the screen and the value printed for var is 0, which I guess signifies whether the command ran successfully or not. Is there any way to assig...
Reading ePub format
... idea about how to read this file format. I tried to parse a sample file with .epub extension using NSXML Parser, but that fails.
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What is the purpose of setting a key in data.table?
... for earlier (outdated) answers.
What exactly does setkey(DT, a, b) do?
It does two things:
reorders the rows of the data.table DT by the column(s) provided (a, b) by reference, always in increasing order.
marks those columns as key columns by setting an attribute called sorted to DT.
The re...
Best practice to return errors in ASP.NET Web API
... I send back the HttpResponseException immediately.
At the end of the day it's an API sending back responses and not views, so I think it's fine to send back a message with the exception and status code to the consumer. I currently haven't needed to accumulate errors and send them back as most exce...
“Parse Error : There is a problem parsing the package” while installing Android application
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You said that the first time you installed the application it worked fine.
The only difference in the steps you outlined between the two versions are:
The version number (I'm assume
that this did not participate in
breaking anything)
The code
The name of the .apk file
Try renami...
Use JNI instead of JNA to call native code?
JNA seems a fair bit easier to use to call native code compared to JNI. In what cases would you use JNI over JNA?
10 Answe...
Difference between Big-O and Little-O Notation
What is the difference between Big-O notation O(n) and Little-O notation o(n) ?
4 Answers
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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
...he same thread can lock the same mutex twice and won't deadlock. Of course it also needs to unlock it twice, otherwise no other thread can obtain the mutex. Not all systems supporting pthreads also support recursive mutexes, but if they want to be POSIX conform, they have to .
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Why aren't programs written in Assembly more often? [closed]
It seems to be a mainstream opinion that assembly programming takes longer and is more difficult to program in than a higher level language such as C. Therefore it seems to be recommend or assumed that it is better to write in a higher level language for these reasons and for the reason of better po...
Lightweight Java Object cache API [closed]
... advanced features, but if your not interested in using them - don't. But it's nice to know they are there if your requirements ever change.
Here is an in memory cache. Created in code, with no configuration files.
CacheManager cacheManager = CacheManager.getInstance();
int oneDay = 24 * 60 * 60...